Fluid-brake for recoil-guns.



0. LAUBER & F. BUMINGHAUS.

FLUID BRAKE FOR REGOIL GUNS.

APPLICATION FILED 00124, 1905.

927,862. Patented July 13, 1909 2 SHEETS-SHEBT' l an}! 2 (RDA mfza OTTO LAUBER AND FRANZ BOMINGHAUS, OF ESSEN-ON-THE-RUHR, GERMANY, ASSIGNORS TO FRIED. KRUPP AKTIENGESELLSCHAFT, OF ESSEN-ON-THE-RUHR, GERMANY.

FLUID-BRAKE FOR BECOIL-GUNS.

Specification of Letters Patent.

Application filed October 4, 1905. Serial No. 281,312.

Patented July 13, 1909.

Toall whom it may concern:-

Be it known that we, O'r'ro LAUBER and FRANZ BoMINeHAUs, residing at Essen-0nthe-Ruhr, West, Germany, both subjects of the EmperorofGermany, have invented a certain new and useful Improvement in Fluid-Brakes. for Recoil-Guns, of which the following is a. specification.

I'he resent invention relates to fluid brakes or recoilguns provided with means for regulating the amount of recoil and the object of the. invention is to make the construction of such fluid brakes as compact as possible.

I In the accompanying drawing, one embodimentof the invention is shown, by way of example.

. Figure 1 shows a side view, partly in section,.of.the parts of the gun having relation to the invention. Figs. 2 and 3 are two longitudins sections of the fluid brake in lanes at an angle to each other, and on an en arged scale Fig. 4 is a sectionon the line 4,4, Fig. 2, and Fig. 5. is a section on the line 55, Fig. 2, looking from the ,right.

he gun-barrel rests on the slide A (Fig. 1)

v which is slidably arranged on the cradle B means of escrow tap 9 (Fig. 2) is firmly se- Elli Dwhich closes that end of.

and provided with a horn a. to which the brake cylinder 0 is rigidlyconnected. The piston-rodF carrying the piston F is mounted rotatably but non-slidably, by means of a tap f 2 (Fig. 1-) in the head I) which closes the cradle. The piston rod F and .the iston F,

are .provided with a central bore .3 (Figs. 1*

and 2) which extends from the front face of the piston F. to thetap f Into the bore f 3 projects a throttling, rod G which is vof the same diameter as the bore and which,by

cured in the the brake cy r and lies toward the horn a. The outer surface of the throttling-rod G is provided Withtwo pairs .0f grooves g and g", the relative position of which is shown in 5. These grooves start in the .proximity of the gap 9 and extend parallel to the longitudinal axis of the throttling-rod. The grooves'g (Fig. 3) extendonl over a small part of the length of the thrott g-rod, while. the grooves 9 (Fig. 2) extend almost to the free or forward endof the throttling-rod. These ooves g and g are of uniform width throug out their length but they decrease in depth in the direction of the arrow 2;, Fig. 1. Two passages f in the piston F and anenlargement f (Figs. 2 and 3) of the central bore in the piston, provide for communication between the respective grooves g g and the fluid spaces in front of and behind the piston. The arrangement of the passages f relatively to the grooves g and g is clearly shown in the drawing. It is, however, to be particularl noted that the parts of the piston which ie between the passages f are wider circumferentially than the grooves 9 The device as above described serves the purpose of regulating the length of the recoil the part behind the plston through the assages f of the piston,the grooves 9 g o the throttling-rod. and the enlargement f of the central bore in the iston. During the movement of the thrott ing-rod, the passage for the fluid will be more and more restricted by reason of the decreasing depth of the grooves g and g and the fluid wil therefore,

be throttled to a gradually increasing extent.

the extent of the grooves 9 If it is desired .to the gradually decreasing.

to get a very short recoil, the iston-rod is A turnedby hand. 'or automatica 1 until. the grooves g are covered by the soid partsof the piston F, in which case communication between the fluid spaces on the two sides of the piston is restricted. to the grooves g alone. The grooves 9 pass beyond the pasr sages f, and the passage ofthe fluid,;therer fore, is cut off and the moving-parts are brolught to a standstill, after a very short re- CO1 It will readily be understood that other lengths or characters of recoil may be obtained, besides the longest and shortest above mentioned, by further changing the relative poslition of the piston. and the grooves 9 an In order. to obtain a smooth return to bat- .tery for each length of recoil, the following arrangement is provided: Each of the forwardends of the grooves 2 communicates with the part H of a centra bore H, H, H in the throttling-rod, through the medium of a passage g The bore extends from the passage 9 to the front end of the throttlingrod and at the point where the part H opens into the enlarged part H, a check valve J is rovided, which is pressed against its seat y a spring '5". Into the wall of the part H is screwed a cylindrical sleeve K. The front part is of the sleeve K is of less outer diameter than the part H of the bore into which it projects thereb leaving an annular space if etween the wa l of the part H and the outer Wall of the part k, which s ace communicates with the'forward end the grooves 9 through the medium of-a air of passages g Thelfree end of the part 9: of the sleeve K is of conical shape so as to form a seat for an annular check-valve M which lies against the wall of the bore H and is held on its seat by a spring m. By virtue of the above described arrangement, the fluid can pass, during recoil, from thefluid space of the cylinder 0 in front of the piston to thespace f 3 in the piston-rod through the passages f the grooves g and 9 the vpassages g and g and so on, the valves J and M, being forced from their seats against the action of the springs i and m. On the return to battery, the fluid cannot ss the same Way from the space f to the iront space of the cylinder, as the valves J and M in this instance act as check-valves. The passage of the fluid in such case is through a pair of longitudinal grooves 9* (Figs. 1, 4 and 5), in the outer face of the throttle-rod, which grooves extend to the front end of the throttle-rod. The cross sectional area of the grooves g is but small in proportion to the cross sectional area of the grooves g 9 in order to insure a return to batterywithout shock. Arecuperatorspring R of known construction (Fig. 1) serves the purpose of returning the barrel tobattery.

V\ hen the above described device for regulating the return to battery is combined with the described device for regulating the length of the recoil, the effect of the latter device will be somewhat influenced, though not materially changed.

As a matter of course, the device for regulating the return tobatter may be omitted or replaced by a device of iiferent construction witho ut departing from the scope of the invention as far as the regulation of th length of the recoil is concerned.

Having thus described the invention, what 'is claimed as new therein is:

grooves and the hollow space of the piston rod, to admit to the latter, fluid utilized in controlling the return movement of the gun barrel.

2. In a fluid brake for recoil-guns, the combination with the hollow piston and hollow piston-rod, the iston being provided with a passage through which the fluid passes from one side of the piston to the other; of a throttling-rod working in the piston and piston rod and provided with longitudinal grooves of diflerent lengths adapted to form a part of said passage, passages admitting fluid from said grooves to the hollow space of the piston rod and containing check-valves resisting back flow therethrou h, and a restricted passage from said hol ow space of the iston rod' to the brake cylinder in front of t e piston.

33. In afluid brake, the combination with the cylinder, the hollow piston rod and the piston carried'thereby, of a throttling rod working in the piston rod, controlling the flowfrom one side of the piston to the other, and provided with a passage roviding communication between the cy inder and the hollow space of the piston rod, a check valve controlling the communication between the cylinder and the hollow space, and means furnishing an outlet from the hollow space to the cylinder.

4. In a fluid brake'the combination with a cylinder and a piston of a hollow piston rod, a rod moving in the hollow piston rod,

means furnishing a communication from the cylinder space to the hollow space in the pis-v ton rod, a check valve contro ing such communication, and means furnishing an outlet from the hollow space to the cylinder.

The foregoing speclfication signed at Dusseldorf, this twenty-fifth day of September,

OTTO LAUBER. FRANZ BOMINGHAU S. In presence of- WILLIAM ESSENWEIN, ERNEsT BODRE. 

